ASTA02H3 Lecture Notes - Apparent Magnitude, Brown Dwarf, White Dwarf

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14 Feb 2013
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Learn how to plot a hr diagram. Note that temperature increases from right to left. Make up a majority of the stars seen in the sky. Source of energy for 90% of the stars (on the graph) Majority of a stars life is spent in main sequence longest period of a star"s life. Bottom right of the area main sequence stars occupy. O, b, a, f, g, k, m, n. Each divided by a subclass ranges from zero to nine. R2 refers to the size or the radius of a star. T4 refers to the surface temperature of a star. Radius increases as you go up the dotted line increase in radius when moving from star #2. to star #1. The hotter a star is, the brighter it is. Figure 1 stars on a vertical line. Application of the luminosity-mass relationship equation (l r2t4) Can tell that star #1. is hotter than star #2.

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